DescriptionTechnical description: Brass; spring buffers; with water-key; plated stockings; with detachable tuning-slide extension legs for low pitch.
Overall size: 1184; bell 156.
Sounding length: minimum 2589; effective lengths of the two tuning slide extensions, each 53.
Bore: at c 50mm from mouthpiece receiver (minimum bore), 11.1; descending slide, 11.5; ascending slide, 11.6; m.t.s. bore, 12.4 13.8; at c 414mm from bell end, 16.4. B = 0.74.
Dia of mouthpiece receiver: m.r.t. 11.8 - 11.2.
Inscribed on bell "CLASS / A / Zephyr / 50 MEDALS OF HONOUR / F B / BESSON & CO / Prototype / 198 EUSTON ROAD / LONDON / BATT / YORK REGT.", the last two lines are defaced and further letters followed `BATT'; inscribed on bell section at joint "7345"; on slide section at mouthpiece receiver "BESSON & CO / BREVETES / 7345"; on outer slide nearest mouthpiece "7345".
Usable pitch: Old Philharmonic pitch; usable at A⁴ = 440 Hz with tuning-slide extension legs. |